Pentax R-322N - Manual (Page 5)

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P2
Usage Precautions
Surveying instruments are high-precision instruments. In order to assure that the
Electronic Total Station R-300 series product which you have purchased will
provide long-lasting maximum performance, the precautions in this manual must
be followed. Be sure to follow these instructions and use this product properly at
all times.
[Solar Observation]
WARNING
Never view the sun directly using the telescope as this may result in loss of
sight. Never point the objective lens directly at the sun as this may damage
internal components. When using the instrument for solar observation, be sure
to attach the special solar filter (MU64) designed for this product to the
objective lens.
[Laser Beam]
Do not stare into laser beam. R-300 is a class-II Laser product. The reflectorless
type is a Class IIIa (3R) laser product.
[EDM axis]
The R series EDM is the red visible laser beam and the beam diameter is very small.
The beam is emitted from the objective center. The EDM axis is designed to coincide
with the telescope sight axis but both axes may not sometimes coincide slightly
according to the intense temperature change and time lapse.
[Target Constant]
Confirm the Target Constant of the instrument before measurement.
If a different constant is to be used, use the correct constant of the target. The
constant is stored in the instrument's memory when turned off.
[Reflectorless and Reflector sheet]
The measurement range is determined by the white side of the Kodak Gray
Card facing the instrument and by its surrounding brightness.
There is a possibility that the range may vary when the target does not satisfy
the conditions above at survey work.
Pay attention to followings in case of distance measurement by Reflectorless.
In case of resulting in low accuracy, perform the distance measurement by
Reflector sheet or Prism. (R-315N/R-325N/R-335N/R-322N/R-323N)
There is a possibility that correct distance measurement may be impossible by
dispersion or reduction of laser beam when the laser beam comes into the
target from diagonal angle.
There is a possibility that the instrument cannot calculate correctly when
receiving reflected laser beam from forth and back directions in case of
measuring the target on the road.